--  @testpoint:opengauss关键字class_origin(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists class_origin;
create function class_origin(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function class_origin;

--关键字带双引号-成功
drop function if exists "class_origin";
create function "class_origin"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "class_origin";

--关键字带单引号-合理报错
drop function if exists 'class_origin';
create function 'class_origin'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `class_origin`;
create function `class_origin`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/